Egypt protest

Egypt protest

Khaled Kamel / AFP/Getty Images

Egyptian students of Al Azhar University who support the Muslim Brotherhood raise their hands showing the four-finger sign -- called Rabaa, or four in Arabic, associated with the crackdown on supporters of ousted Islamist president Mohamed Morsi -- during clashes with riot police in Cairo.

Egyptian students of Al Azhar University who support the Muslim Brotherhood raise their hands showing the four-finger sign -- called Rabaa, or four in Arabic, associated with the crackdown on supporters of ousted Islamist president Mohamed Morsi -- during clashes with riot police in Cairo. (Khaled Kamel / AFP/Getty Images)

Egyptian students of Al Azhar University who support the Muslim Brotherhood raise their hands showing the four-finger sign -- called Rabaa, or four in Arabic, associated with the crackdown on supporters of ousted Islamist president Mohamed Morsi -- during clashes with riot police in Cairo.